Air valve



R. E. MITTON AIR VALVE Sept. 14- 1926. L599I Filed Dec. 8, 1925 i eteiiteol lei,

AIR VAQEIVF.

Application filed December My invention relates to valves and has for its object to provide new and eilicient automatic valve for controlling air.

A .fuirltlvi r ol-ie t to provide a valve whereby 9 for sure 01E compressed air through air lines, in either direction may be automatically maintained, released. or applied, to control inechai'iical movements and to overcome momentum and particularl to provide a quick acting automatic control valve for air l'JI'tthIi-B meehenisii on auto'rno b es and. other coi'iveyaiices. Also to coatrol the distribution of power to such c011- ogq' aces= lose objects ii. accomplish with the device e iii in e accompanying drawii vrliieh similar letters and. numerals 'eiice indicate like parts throughout the as described in the spool live and iorniiog apart of this application I ointetl out in the appended claims, it belt understood that slight changes and, modifications may he metloin construction Without departing from the spirit of the invention as set out in the claims,

In. the drawings in which I have shown the best and most Substantial embodiment of my invention, Figure 1 is an elevation of my t' We with parts out away. Figure 2 is a longitudinal dia rietrical section of the valve. igiire 8 is the same section as shown in Figure 2 with the valve 21' closed. and the valve l l open.

In the drawings l have shown the major portion of my valve enoloseol in a cylindrical casing); A, which has closure caps l and 9, screwed oii the ends thereof. A hollow piston rozl B slidably carried in the oasing A, which TLKl and its connections form. the other portion of my valve. On one end, of saiel piston rod B a closure cap 12 is s revved having portslQ bored therethrough to allow passage of air, when air escapemeiit is required in the operation of the valve. The. other end or" the piston rod 13 is fastenecl centrally in a piston C which is opera tively carried. in the casing Aend divides the interior of said casing A into two coin partments m d i. A main spiral spring "5 is carried in compartment l with oiie eioCl of the spring; hearing against the piston C and the other eml against the closure cap cured to one face of the piston C with the free end. foition passed axially through the U I L110 piston U and o .screivecl is externaliy externally threaded and which piston head 18 W11 valve :23. o'nq'i ges in the valve scat i'tn inner casing" 6is co'nci'entricollv so S, 1825. Serial lilo. I'ilfililfi.

closure cap A. jam ii on the casing 6 to limit t.

While allowi ig the. posits direction '4 \A, L air tube 259 15 so. on the en J 1 I I the casing l. 'alrioal is integrally with. saitl piston sleeve not 8 the enclportion of 1S "crew eel; and iii. the o sail flange or sleeve Hill 1 0 is end or the piston rocl sleeve not 8 in Will h 1/ thr the packing washer 10 an] 1.: which holds the Washer at l on the piston assembly {L to is centrally horerl eml. cu seat 13 in which the valve v The valve M has a valve secured centrally thereto anti saitl stem is enlarger it to form a guide which is longitudiozill slidahle iii the said ipistoo. ro l Holes ii are provided in the enlarges": guide it; to allow passage of air therethrough The other end portion of said. valve stem 15 is n to receive the soitahlv packed piston head which saints size as the guide 16 aiocl is also ioi" tuclinally sliclahle in the said pie i too.

o ie valve stem 15 longitudinally Within the S ltll ton rod B The said valve stem 'lt trally bored for a portion of its to receive the valve stem E with the of the bore ehainferetl to form a valve s 19, Ports 20 are bored ill the wall of t internally bored portion of the valve stem 15 to allow passage of air the through. A. valvefil is formed. on val stem E anti when the stone is opei'e end portion of the said valve stem l lat-god toiforrn a guide I22,\Vi1lCiil loo todiiia-lly slidehlo iii the int! :il.

portion ofthe valve stem 15 out. w

a support for the one earl valve stem The other eml 0t valve stem sliclahlv carried in the ("lo we sure cap 12 of the piston rod xi 'i'lfl extreme eml of said valve stem E1 and internally thr emietl to re bolt- The said e ve hoit so that a lever may he 'ooiioeot' ill ill)

- cording for operating the valves 21 and i i. A spiral spring 2i is carried within the said piston rod B between the guide '16 and the piston (l to normally hold the valve Ll in its seat 13. An air connection *25 is provided on one side of the said piston rod B to which an air line may be attached to carry the air to the desired places of use. branch air connection 20 provided on the side of 25 and a similar connection :27 is rovided in the side oi the chamber 3 of the casing A to which connections a flexible air tube 28 is attached to carry back-pressure of air to the chamber 3 from the air connection 25.

In the operation of my valve, pressure is applied at the eye bolt 23 in order to move the stem E longitudinally. This operation results in the closing of the exhaust valve 21 and the opening of the intake valve 14, which allows air to enter at the intake valve 1 1- and flow past or around the same, through the ports 1'? in the guide 16 and into the tubular piston rod B, and against the piston head 18, through the ports 20 of the valve stem 15 and against the closuresideot' the exhaust valve 21, out through the passage 25 to the mechanism to be ope'pated, and also. by way of the flexible connection 28 into the automatic chamber 3. This produces a downward pressure on the piston C, with its valve seat 13, and shuts oil the air flow when suflicient pressure is induced to compress the main spring 5 far enough to allow the valve 1% to seat. At the same time a. restraining pressure is thrown against piston 18 in.the hollow piston rod 3 in order to prevent the involuntary tendency to over apply the pressure by the recedin action of the piston C. It is evident that should a further movement of the valve mechanism be made at this time, that additional pressure would be admitted, and automatically ent 0d, ac-

to the extent of the movement operation as outlined above, The

or decrease of pressure is secured or so coniplished by merely raising the exhaust valve 21 out of its seat, vvl'iereupon the air of the entire system will escape through the said, valves and out through the ports 12" in the cap 12 ot the piston rod B. It will be seen that the reduction of pressure thus iii-ought about in the chamber 3 will cause the piston C to be raised by the spring expansion beneath it, carrying the closed in talac valve "llo'ith it and keeping the exhaustvalve seat 19 which is chamfered in the head of the tubular valve stem 15 in closeprosimity to the receding alve head 21, so that should the raising oi said exhaust valve :21 cease. then the release at pressure would instantly cease, because of the seating of the valve 21 by the pressure of the main spring 5. it is also obvious that any leak otthe piessu 'e on the operated valve assembly at i The the ce bolt :23 remainim constant.

graduation of pressure is determined by the extent of movement at the eye bolt and the tension of the main spring 5.

Having thus described my invention, and its operation I desire to secure by Letters Patent, and claim:-

1. An automatic control valve comprising a casing; a piston slidably carried in said casing; exhaust and intake valves operable by the movements of the piston; means to manually operate said valves in one direction; means to convey 'air to said valves; a spring to regulate the movement of said piston; means to move said piston against said spring tension by the involved air pressure; means to utilize the movement, ot the piston to operate the said valves to automatically regulate the amount of air pressure allowed to pass the valves.-

An air valve comprising a casing; a piston operable within-said casing; a spring to regulate the movements of said piston; a hollow. piston rod attached to said piston; valves operable within said piston rod; means to convey compressed air against the head of said piston; means to manually operate the valves to allow varying air pres sures to pass them i An air valve comprising a casing; a piston operable therein and dividing the interior of the casing into two compartments; a spring in one compartment to regulate the movement of said piston; a lliOllow piston rod attached at one end to said piston; a flexible connection between the casing and piston rod; coacting valve stems operable in. said piston rod; a valve on each of said stems either of which is adapted to close when the other is open; and means to direct compressed air through said casing and hollow rod in either direction.

4. An air control mechanism comprising a casing; a piston operable therein and havmg a central valve seat opening; a spring to regulate the movement of said piston; a hol low piston. rod having air ports its well and with one end attached to said piston; coacting valves operable in said piston rod either ct which is adapted to open when the other is closed: and means to direct conipresed air in either direction through said casing and piston rod.

5.1 m air control mechanism comprising a casing having a hole in its side wall; a piston operable in the casing; a spiral spring carried in the casing adapted to be compressed by said piston: a hollow piston roe applied air would be automatically replaced secured to one face of said piston and having an air port in its well; an interior casing secured on the other face of said piston and movable therewith; valve stems operable in said piston rod; a valve on each of said stems either of which is closed when the other is opened; a flexible connection be tween the interiors of the first mentioned casing and said piston rod; and means to direct compressed air through the first mentioned casing and said piston rod.

6. An automatic control valve comprising a casing; a piston operable therein having a central valve seat; a main spring to regulate the movement of said piston; a piston'rod piston, and tubular in form necting a chamber within said casing with p the interior of said piston rod; valve stems operable in the piston rod; intake and ex haust valve heads carried on the stems; a spring in said piston. rod to valve normally seated in said central valve seat; means to manually operate the said valves; and means to direct compressed air through the intake valve.

In testimony whereof I have affixed my signature.

ROBERT E, MITTON.

hold the intake 

